Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd408db45e37752b…

MALICIOUS

PDF

81.8 KB Created: 2021-07-02 18:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4c88f815bb42cc963fb4e9df69c03c50 SHA-1: 82c18ce3c4f95fc8ab4bc21d63031bf285118604 SHA-256: cd408db45e37752b73eece772579c581d8e2a951006b9f041197b4eed9e56f7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sugarfree-gelato.com/upload/file/66858642598.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c122390a2be---refegefiwigidelumijaxebug.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/madosizuwus.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/71237419703.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa670e1363---lilivaruku.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/m25d7gjgn67nel3r3itusm3nv3/9604238067.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/97576728599.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wotigebajew.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad540b21cde---90036239536.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/37716470254.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/94efff571153e77240ae0d12f4121348/5490630956.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/64029780484.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62c75e644---xuladuzejadabozilipuvibe.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/925e9343a1365b314a14efcc9a28f299/nozizebegigamanetaju.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a17322ba871---viwipirulux.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/68d20a84ca572f7557b902451aa03ae7/39386089239.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/p7423s6kn4plger1fr08anp0q9/31939294982.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/48848753269.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/87872670968.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e31717e3f41a7b5b737158f62fdfbf99/40367974411.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/6858531617.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7c7714e3540b2a66565c517f852322c3/nirox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=amanda+holden+a+thousand+yearsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 10616 bytes
SHA-256: a9be0f16982a8b453446600d3adec6f156115cb1e4a87d5cc7018abe3f5263cd
font_01_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 18296 bytes
SHA-256: 065629df20e6b9556ea7b871ac4b9aa963a7fce47d55c52c0ffc37a2f39a3d7a